cpanato: [go1.16] Update to go1.16.8

JobBuild
104905
09-10 13:32
eea39628
09-10 13:31
pull-kubernetes-conformance-kind-ga-only-parallel 1437887625905049600 1436321318428479488
pull-kubernetes-conformance-kind-ipv6-parallel 1436321318252318720
pull-kubernetes-dependencies 1437887625783414784 1436321318294261760
pull-kubernetes-e2e-gce-100-performance 1437887625766637568 1436321318227152896
pull-kubernetes-e2e-gce-ubuntu-containerd 1437887625649197056 1436321318122295296
pull-kubernetes-e2e-kind 1437887625846329344 1436321318365564928
pull-kubernetes-e2e-kind-ipv6 1437887625875689472 1436321318394925056
pull-kubernetes-integration 1437887625816969216 1436321318332010496
pull-kubernetes-node-e2e-containerd 1437887625716305920 1436321318185209856
pull-kubernetes-typecheck 1437887626488057856 1436321319766462464
pull-kubernetes-unit 1437887625938604032 1436321318931795968
pull-kubernetes-verify 1437887627331112960 1436321320609517568
pull-kubernetes-verify-govet-levee 1437887625695334400 1436321318160044032
pull-publishing-bot-validate 1436321321444184064